. Electronic apparatus for biological research. Electronic apparatus and appliances; Biology -- Research. APPENDIX Explanation of operation of Figure Before discussing the detailed operation of this circuit (which is shown in simphfied form) it is perhaps as well to consider why something more elementary would not suffice. The requirement of the device is that upon the receipt at the input terminal of a brief negative-going pulse of above a certain size, a large negative-going square wave of controllable duration shall be generated at that terminal. Clearly some kind of flip-flop is requi
. Electronic apparatus for biological research. Electronic apparatus and appliances; Biology -- Research. APPENDIX Explanation of operation of Figure Before discussing the detailed operation of this circuit (which is shown in simphfied form) it is perhaps as well to consider why something more elementary would not suffice. The requirement of the device is that upon the receipt at the input terminal of a brief negative-going pulse of above a certain size, a large negative-going square wave of controllable duration shall be generated at that terminal. Clearly some kind of flip-flop is required. Suppose we set up the circuit— already discussed in Part I—of Figure V^ is normally cut off", V^ conducts heavily and we attempt to trigger the arrangement by a negative pulse applied to F^ anode: then we bump up at once into at least three difficulties. The first is that there is no simple way of varying the threshold HT +. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Donaldson, Peter Eden Kirwan. New York, Academic Press
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